.ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    width: 400px;
    height: 380px;
    position: relative;
    left: 50%;
    top: 50%;
    transform: translate(-50%, 50%);
}

/* 以下代码不需要修改 */

li {
    width: 110px;
    height: 110px;
}

.ul li {
    box-sizing: border-box;
    margin: 10px;
    list-style: none;
    line-height: 100px;
    text-align: center;
    font-size: 20px;
    border-radius: 10px;
    cursor: pointer;
    background: linear-gradient(90deg, #72a8f8 0%, #3e93d3 50%, #5385e2 100%);
    text-shadow: 5px 5px 5px #1004ad;
    color: #ffffff;
}

#start {
    background: #1004ad;
}

.ul li.active {
    background: rgb(255, 153, 0);
    color: #ffffff;
}

#award {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    top: 100px;
    display: block;
    width: 320px;
    height: 40px;
    background-color: rgb(255, 255, 255);
    border-radius: 2px;
    box-shadow: rgba(0, 0, 0, 0.3) 0 0 3px 2px;
    letter-spacing: 2px;
    text-align: center;
    line-height: 40px;
}
